.shang-left {
    width: 800px;
    height: 310px;
    cursor: pointer;
    margin: 0 30px 0 100px;
 margin-top: 10px;
 object-fit: cover;
 border-radius: 8px;
  }
  .contentstyle {
    height: 310px;
    line-height: 310px;
    text-align: center;
    color: #fff;
    object-fit: cover;
 border-radius: 8px;
   
    background: #364d79;
    width: 100%;
  }
  .jiantou {
    display: none;
    position: absolute;
    bottom: 50%;
    z-index: 100;
    width: 40px;
    height: 40px;
    font-weight: lighter;
    color: rgba(255, 255, 255, 0.6);
    cursor: pointer;
  }
  .arrow-lefts{
    left: 0px;
    position: absolute;
  }
  .arrow-right{
    right: 0px;
    position: absolute;
  }
  .jiantou:hover {
    opacity: 0.85;
  }
  .shang-left:hover .jiantou {
    display: block;
  }
